A comprehensive analysis of audio format testing through the 2G/2G+ devices is included in the spreadsheet attached to this email.
The 2G/2G+ devices support 2-channel PCM audio, and compressed multichannel audio formats up to DTS 5.1, THX 7.1, and Dolby Digital Plus 7.1.
Lossless audio formats such as DTS-HD Master 7.1, Dolby TrueHD, DTS:X and Dolby Atmos are not supported. Multichannel PCM is not supported. For applications that require these lossless multichannel audio formats, the 3G platform should be used.